EP1K50QI208-2N

[speranskyanton]

Hello!
Could you please advise whether the marking structure on the EP1K50QI208-2N components — which have been discontinued for a long time — matches the one shown in the attached photo, particularly the format of the date code (week of manufacture)?
I would be extremely grateful for a prompt response, and I would also appreciate it if you could share any available documentation on the marking system for the ACEX 1K series.

Thank you very much in advance!

[sstrell]

No attached photo.

[speranskyanton]

Hello!
Apologies — I’m attaching the photos now.
Photo marking shows the marking of a chip from a different series, but in all available documentation, the week of production is indicated using specific symbols.
Is it possible that on older components the production week could be marked simply as, for example, “20”?
Thank you!

[FvM]

Hi,

not sure what you want to achieve, but I can confirm that ACEX 1K series used similar marking with YYWW date code, e.g. below 0125.

[speranskyanton]

Hello!
Thank you!
Here is an example: a photo of a component with the date code “1721”.
In the current marking format, “21” does not appear to be a valid week code.
Was it common in older marking formats for the production week to be represented by any symbols, such as “21”?

[FvM]

Hi
"In the current marking format, “21” does not appear to be a valid week code." What else?

[speranskyanton]

Hello!
That’s exactly why I am asking you — the components were discontinued in 2017, while all the current documents about component marking are from around 2019–2020. Could it be that in earlier years the week code format was different?
Thank you!

[FvM]

Hi,

as far as I see, the date code format didn't change between 2001 and today. 1721 should be 2017 week 21. Any indications that it doesn't fit?  

[speranskyanton]

Hello!
Thank you!
So, in earlier markings, could any production week number be present, rather than only specific codes?

[Fakhrul]

Hi speranskyanton,

Yes, as FVM mentioned:

The date code on the top marking of the Altera EP1K50 chip follows the standard YYWW format:

• The first two digits represent the year of manufacture (17 = 2017).
• The last two digits represent the work week within that year (21 = week 21).

So, a date code of 1721 means the device was manufactured in week 21 of 2017.

I tried to find official documentation specific to FLEX 10K devices, but could not locate a direct reference. The closest available documentation is the Product Marking Information for MAX® II, MAX® V Devices (https://cdrdv2-public.intel.com/732570/product-marking-information-max-ii-and-max-v.pdf), which uses the same YYWW format for date codes. Altera has generally applied this format consistently across their product families.

Regards,

Fakhrul

[Fakhrul]

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[speranskyanton]

Hello!
Returning to this question — is it possible that the lot code in the marking is positioned so close to the main marking (closer to the center)?
Please reply as soon as possible.
Thank you!